diff options
| -rw-r--r-- | sound/pci/ca0106/ca0106_main.c | 34 |
1 files changed, 16 insertions, 18 deletions
diff --git a/sound/pci/ca0106/ca0106_main.c b/sound/pci/ca0106/ca0106_main.c index 0a3d3d6e77b..8e69620da20 100644 --- a/sound/pci/ca0106/ca0106_main.c +++ b/sound/pci/ca0106/ca0106_main.c @@ -1002,29 +1002,27 @@ snd_ca0106_pcm_pointer_playback(struct snd_pcm_substream *substream) struct snd_ca0106 *emu = snd_pcm_substream_chip(substream); struct snd_pcm_runtime *runtime = substream->runtime; struct snd_ca0106_pcm *epcm = runtime->private_data; - snd_pcm_uframes_t ptr, ptr1, ptr2,ptr3,ptr4 = 0; + unsigned int ptr, prev_ptr; int channel = epcm->channel_id; + int timeout = 10; if (!epcm->running) return 0; - ptr3 = snd_ca0106_ptr_read(emu, PLAYBACK_LIST_PTR, channel); - ptr1 = snd_ca0106_ptr_read(emu, PLAYBACK_POINTER, channel); - ptr4 = snd_ca0106_ptr_read(emu, PLAYBACK_LIST_PTR, channel); - if (ptr3 != ptr4) ptr1 = snd_ca0106_ptr_read(emu, PLAYBACK_POINTER, channel); - ptr2 = bytes_to_frames(runtime, ptr1); - ptr2+= (ptr4 >> 3) * runtime->period_size; - ptr=ptr2; - if (ptr >= runtime->buffer_size) - ptr -= runtime->buffer_size; - /* - printk(KERN_DEBUG "ptr1 = 0x%lx, ptr2=0x%lx, ptr=0x%lx, " - "buffer_size = 0x%x, period_size = 0x%x, bits=%d, rate=%d\n", - ptr1, ptr2, ptr, (int)runtime->buffer_size, - (int)runtime->period_size, (int)runtime->frame_bits, - (int)runtime->rate); - */ - return ptr; + prev_ptr = -1; + do { + ptr = snd_ca0106_ptr_read(emu, PLAYBACK_LIST_PTR, channel); + ptr = (ptr >> 3) * runtime->period_size; + ptr += bytes_to_frames(runtime, + snd_ca0106_ptr_read(emu, PLAYBACK_POINTER, channel)); + if (ptr >= runtime->buffer_size) + ptr -= runtime->buffer_size; + if (prev_ptr == ptr) + return ptr; + prev_ptr = ptr; + } while (--timeout); + snd_printk(KERN_WARNING "ca0106: unstable DMA pointer!\n"); + return 0; } /* pointer_capture callback */ |